Isaiah 7:20

7:20 At that time the sovereign master will use a razor hired from the banks of the Euphrates River, the king of Assyria, to shave the head and the pubic hair; it will also shave off the beard.

Isaiah 8:7

8:7 So look, the sovereign master is bringing up against them the turbulent and mighty waters of the Euphrates River – the king of Assyria and all his majestic power. It will reach flood stage and overflow its banks.